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Your partner may obtain a visa but it will have to be on her own merit. She cannot claim to be your partner, or being financially supported by you until you are officially divorced.
She will need to show she has a job in France or has the means to support herself financially independently to obtain a long term visa.
Basically she will need a long term visitor's visa. These are issued for 12 months max and renewable. And are the "easiest" (all is relative in those matters to secure).
Besides all ID and criminal record, she will need to provide French consular officers in Brazil with all information that will enable them to ascertain that she has enough regular legal income to live in France for 12 months. Either staying at a hotel or by taking on a short term tenancy lease. Depending on the region of France in which she will opt to settle this will vary between 2000 and 3000 €/months. This is a personalised assment made by consular officers. She will need to bring her tax returns for the last 3 years showing her rental income, bank statements, copies of leases. As for health insurance, she must show that she has purchased a contract covering all costs as well as emergency repatriation for the whole duration of her stay.